A Banbury man is awaiting sentence for possessing heroin with intent to supply.
Christopher Sinclair, 38, of Marlborough Road, Banbury, denied the offence but was convicted by a jury on May 2.
He was arrested in a lay-by near the Pear Tree interchange, north Oxford, last June.
Police found 10 small packages of heroin, worth £200-£250, in his car.
Rachel Drake, defending, said Sinclair had a drug habit.
Judge Anthony King adjourned the case so that pre-sentence reports could be prepared.
He granted bail, saying he wanted to investigate the option of drug treatment, but warned Sinclair: "The seriousness passes the custody threshold."
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